ati's profile - activity

I could find contours of an object in an image by using findContours.

and by using this I could crop the object contours.

Dist.copyTo(crop, mask);

now, I need to find the index of crop Image in Dist image.

to do that I converted the Mat into the float to pointer and I called it cropped!

and then I tried this:

for(int j=0; j < (Dist.rows * Dist.cols); j++){
            if(cropped[j] != 0 ){
                row = (j / width) + ((Dist.rows));
        col = (j % width) + (Dist.cols);

            }
            Index.push_back(std::make_pair(row,col));
            }

But it does not give me any correct answer...

To do normalization using opencv I am using this function:

cvNormalize(Src.data, Src.data, 255, 0, CV_MINMAX);

type of the input is Mat...to be able to use it as a pointer I have used .data but I get memory allocation error when I try this function...

Does anyone have any idea?

Thanks in advance

Hi..How do I get the max and min value in a Mat? Is there any function in Opencv which return these two values?

how do I find the coordinate of these 4 points in a detected object(which does not have any specific shape)?

what is opencv equivalent of mat2gray using in Matlab?

I have a text file contains pixel values of an Image. I want to import it to the code and then normalize it...

How do I load it?

Thanks in advance..

Does anyone know How Gaussian filter algorithm apply to an image(in OPENCV)that is this much fast?

Hi, I have a question, but it is not about opencv. It is about Matlab. Actually, I could use opencv filtering functions to filter my image. Now, I want to import this Image(Matrix) to matlab and then visualize it as a surface.

something like this file: link text

How do I do that?

Thanks in advance..

shouldn't I use "THRESHOLD TO ZERO" as its type? if yes, what should I write in maxval part?!

they should not be changed..if it is 587 after thresholding should remain 587!

I am getting creazy with Thresholding function in opencv...

I want to keep all values higher than 200 and remove rest of them!

seems I should use this THRESH_TOZERO type but I do not know what should I write instead of double maxval

threshold( Src2, dst, 200, double maxval ,THRESH_TOZERO );

any idea would be appreciated...

EDIT:

Thanks for your comments, I changed it like this but still I do not get the correct result:

#define THRESHOLD TO ZERO 3
threshold(Src2, dst, 200, CV_THRESH_BINARY , 3);

I have a basic question in image processing...

I want to know what would be the first derivative of a pixel in an image? doed it have any meaning?

and what would be the result of calculating structure tensor at each pixel?

Thanks in advance..